/* 头部 */
.head{
    height: 68px;
    width: 100%;
    border-bottom: 1px solid #aec7ec;
    box-sizing: border-box;
    position: absolute;
    z-index: 999;
}
/* 头部导航 */
.head-nav{
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}
.head-nav li{
    float: left;
    line-height: 66px;
    font-size: 16px;
    text-align: center;
    margin-right: 38px;
}
.head-nav li a{
    color: #fff;
}
.head-nav li:hover{
    border-bottom: 3px solid #fff;
}
.head-nav .active{
    border-bottom: 3px solid #fff;
}
/* 头部登录按钮 */
.head-login a{
    float: left;
    margin-right: 10px;
    font-size: 12px;
    line-height: 22px;
    text-align: center;
    color: #fff;
}
.head-login a:hover{
    opacity: 0.7;
}
.head-login .login{
    width: 55px;
    border-radius: 10px;
    border: 2px solid #ccc;

}
.head-login .register{
    width: 74px;
    border-radius: 10px;
    background-color: #ed510a;
    border: 2px solid #ed510a;
}
/* 粒子效果 */
.banner {
    position: relative;
    top: 0px;
    left: 0px;
    height: 360px;
    width: 100%;
    background: #f1f1f1;
    background: radial-gradient( at center, #1d1d1d, #1d1d1d);
}

#particles-js {
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;
    width: 100%;
    height: 360px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 0;
}
.box{
    position: absolute;
    left: 50%;
    top: 200px;
    transform: translateX(-50%);
    /* z-index: 9999; */
}
.box-left{
    width: 620px;
    height: 252px;
    box-sizing: border-box;
    padding: 45px 100px 0px 45px;
    background-color: #fff;
}
.box-left h3{
    line-height: 60px;
    font-size: 24px;
}
.box-left p{
    font-size: 14px;
    line-height: 22px;
    color: #666;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
    overflow: hidden;
}
.box-right{
    width: 580px;
}
.box-right img{
    width: 100%;
}
.introduce{
    margin-top: 200px;
}
.introduce .cont{
    width: 1100px;
    margin: 0 auto;
}
.introduce .cont .text{
    font-size: 12px;
    color: #181818;
    line-height: 25px;
    margin-top: 25px;
}
.introduce .cont .one{
    font-size: 10px;
    color: #666;
}
.introduce .cont .two{
    width: 15px;
    height: 4px;
    background-color: #00bdff;
    position: relative;
    top: 6px;
    right: 6px;
}
.introduce .cont h2{
    font-size: 22px;
    color: #000;
    margin-top: 35px;
}
.introduce .cont .big{
    width: 100%;
    margin-top: 60px;
    margin-bottom: 160px;
}